Stop watch application This is a very useful app which is made for people working in electronics and for sportsmen. How is it used? Let's know. In this app you can see three buttons and a display. The first button is written Start. On clicking this button, the stop watch starts. Which shows the second time. The stop button in it is used to stop the stop watch. The third button is reset to zero the display of the stop watch so that you can count the stop watch again